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How much do we know about human consciousness?
In 1998, a brain scientist and a philosopher made a bet. The stakes? A case of fine wine. The computational neuroscientist Christof Koch believed that within 25 years - that's right now - we would understand how the brain achieves consciousness. The Australian philosopher David Chalmers disagreed.
Newsday's James Copnall spoke to both of them. First, David explained how the bet came about...
(Image: two human heads in profile, Credit: iStock/Getty Images)
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